/*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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/*
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* CPU test
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* Complex calculations
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*
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* The calculations in this test are just a combination of simpler
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* calculations, but probably under different timing conditions, etc.
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*/
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#include <post.h>
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#include "cpu_asm.h"
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#if CONFIG_POST & CONFIG_SYS_POST_CPU
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extern int cpu_post_complex_1_asm (int a1, int a2, int a3, int a4, int n);
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extern int cpu_post_complex_2_asm (int x, int n);
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/*
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* n
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* SUM (a1 * a2 - a3) / a4 = n * result
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* i=1
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*/
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static int cpu_post_test_complex_1 (void)
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{
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int a1 = 666;
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int a2 = 667;
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int a3 = 668;
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int a4 = 66;
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int n = 100;
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int result = 6720; /* (a1 * a2 - a3) / a4 */
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if (cpu_post_complex_1_asm(a1, a2, a3, a4, n) != n * result)
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{
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return -1;
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}
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return 0;
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}
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/* (1 + x + x^2 + ... + x^n) * (1 - x) = 1 - x^(n+1)
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*/
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static int cpu_post_test_complex_2 (void)
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{
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int ret = -1;
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int x;
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int n;
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int k;
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int left;
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int right;
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for (x = -8; x <= 8; x ++)
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{
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n = 9;
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left = cpu_post_complex_2_asm(x, n);
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left *= 1 - x;
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right = 1;
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for (k = 0; k <= n; k ++)
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{
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right *= x;
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}
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right = 1 - right;
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if (left != right)
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{
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goto Done;
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}
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}
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ret = 0;
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Done:
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return ret;
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}
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int cpu_post_test_complex (void)
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{
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int ret = 0;
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int flag = disable_interrupts();
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if (ret == 0)
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{
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ret = cpu_post_test_complex_1();
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}
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if (ret == 0)
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{
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ret = cpu_post_test_complex_2();
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}
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if (ret != 0)
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{
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post_log ("Error at complex test !\n");
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}
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if (flag)
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enable_interrupts();
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return ret;
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}
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#endif
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